Arachnids were some of the first land animals .
What are Arachnids?
- Spiders, harvestmen, mites, and ticks are arachnids, as are their cousins such as scorpions, which do not reside in Michigan.
- Arachnids have eight legs and do not have antennae, unlike insects.
- Arachnids have two portions to their bodies: the cephalothorax in front and the abdomen behind.
how did arthropods decide to settle on land?
- The arthropods didn't have to wait for the ozone layer to emerge before colonizing the land because they're active at night and can readily dodge the sun's destructive rays.
- They only did it in the dead of night.
- They have evolved to exist in a terrestrial setting.
- Reduced body size, antennae, complex eyes, a comprehensive digestive system, and breathing through the trachea, gills, or book lungs are just a few of these adaptations.
- In arthropods, nitrogenous wastes are excreted in the form of uric acid.
- Arthropods are symmetrical on both sides.
- They are triploblastic creatures having a blood or haemolymph-filled body cavity.
- Arthropods are hence haemocoelomates.
- The body of an arthropod is divided into three sections: head, thorax, and abdomen.
- Arthropods have an open circulatory system that includes a heart and an artery.
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